* {
  box-sizing: border-box;
}

ul {
  list-style-type: none;
}

body {
  font-family: Verdana, sans-serif;
}

.month {
  padding: 70px 25px;
  width: 100%;
  background: #1abc9c;
}

.month ul {
  margin: 0;
  padding: 0;
}

.month ul li {
  color: white;
  font-size: 20px;
  text-transform: uppercase;
  letter-spacing: 3px;
}

.month .prev {
  float: left;
  padding-top: 10px;
}

.month .next {
  float: right;
  padding-top: 10px;
}

.weekdays {
  margin: 0;
  padding: 10px 0;
  background-color: #ddd;
}

.weekdays li {
  display: inline-block;
  width: 13.6%;
  color: #666;
  text-align: center;
}

.days {
  padding: 10px 0;
  background: #eee;
  margin: 0;
}

.days li {
  list-style-type: none;
  display: inline-block;
  width: 13.6%;
  text-align: center;
  margin-bottom: 5px;
  font-size: 12px;
  color: #777;
}

.days li .active {
  padding: 5px;
  background: #1abc9c;
  color: white !important
}

/* 添加不同尺寸屏幕的样式 */
@media screen and (max-width:720px) {

  .weekdays li,
  .days li {
    width: 13.1%;
  }
}

@media screen and (max-width: 420px) {

  .weekdays li,
  .days li {
    width: 12.5%;
  }

  .days li .active {
    padding: 2px;
  }
}

@media screen and (max-width: 290px) {

  .weekdays li,
  .days li {
    width: 12.2%;
  }
}